HOMEOSTASIS - POSITIVE VS NEGATIVE FEEDBACK Flashcards

1
Q

In Homeostasis we have a thing called Positive and Negative feedback with Negative feedback being the most common.

This is a question we can’t promise will come up but there is a strong likelihood as it has come up a lot within the last few years.

So let’s start learning about each one so you will be able to explain them if required.

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2
Q

Positive Feedback is a mechanism that amplifies or increases the direction of change to restore homeostasis.

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3
Q

The best example I can give with Positive feedback is Childbirth:

Oxytocin is continually released during labor to intensify uterine contractions, leading to further release of oxytocin.

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4
Q

Another example of positive feedback is a fever response to infection

When the body detects an infection, it initiates a fever response to increase body temperature and aid in fighting the infection

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5
Q

Another example for Positive feedback is blood clotting process, when a blood vessel is damaged, platelets release chemicals that attract more platelets to the site, forming a clot to stop bleeding.

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6
Q

Another Positive feedback example is milk production from Mother as a baby suckles at the breast, it stimulates nerve endings that signal the release of more milk from the glands.

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7
Q

What is the purpose of Positive Feedback in Homeostasis?

A

To rapidly and effectively bring about a physiological change in response to a specific condition or stimulus.

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8
Q

What are the components of a Positive Feedback loop?

A

Stimulus, sensor/receptor, control center, effector, and response

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9
Q

How does Positive Feedback differ from Negative Feedback?

A

Positive feedback amplifies the response, while negative feedback reverses or opposes the response to maintain stability.

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10
Q

Now let’s move on to Negative Feedback …

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11
Q

What is negative feedback?

A

A regulatory mechanism in which a change in a variable triggers a response that opposes the initial change, thus restoring equilibrium.

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12
Q

How does negative feedback regulate body temperature?

A

When body temperature increases, receptors in the skin and brain detect the change and trigger responses to cool the body down, such as sweating and vasodilation.

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13
Q

What is an example of negative feedback in blood glucose regulation?

A

When blood glucose levels rise after a meal, the pancreas releases insulin to stimulate the uptake of glucose by cells, thus lowering blood glucose levels back to normal.

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14
Q

Why is negative feedback important in maintaining homeostasis?

A

It allows the body to continuously monitor and adjust various physiological variables to prevent extreme deviations that could be harmful to the organism.

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